1、由图得A=2 T=8 则w=2派/8=派/4
故f(x)=2sin(派/4x+φ) 而f(1)=2
得2sin(派/4+φ)=2解得φ=派/4
故f(x)=2sin(派/4x+派/4)
2、g(x)=f(4-x)=2sin(-派/4x+派/4)